[1] You can also use porcelain SMT capacitors which are available from American Technical Ceramics or Down East Microwave.
[2] Optional RF input protection. Any quality microwave diodes will work. Should be in a SMT package.
[3] Optional filters, not needed but highly recommended.

You are better off buying the SMT resistors from Mouser in groups of 100 each. They only cost $1.90 and they usually throw in a few extra.